Lamp for instrument boards of motor vehicles



I 1644,277 -4 2 I x c. H. H. RQDANET LAM FOR INSTRUMENT BOARDS OF MOTORVEHICLES, Fi led Julyl, 1925 Patented Oct. 4, 1927.

UNITED ST TES.

CHARLES HILAIRE HENRI IEtODANET, OF VERSAILLES, FRANCE, A SSIGNOR 'TOsooin'rn ANONYME ETABLISSEMENTS ED. JAEGER, or

COMPANY.

Application filed'July 1, 1925, Serial No.

Lamps are already known for the instrument board for a motor vehicleinwhich an electric lamp is located in a tubular casing formed withslots for the passage of light and furnished with a reflecting surface.The reflecting surface is conical with its axis coinciding with that ofthe lamp casing which carries it'and the summit of the cone is directedtowards the lamp, the slots in the 19 casing being cut in the-upper partthereof in such a Way that the light rays passing therethrough are allreceived by the conical surface and reflected on the instrument board. VI

The present invention relates to improvements of the lamps andessentially consist in constructing and arranging the hood which coversthe lamp and which is formed with the openings for the passage of thedirect 20 light rays, and carries the conical reflecting surface so asto constitute the switch of the electric circuit feeding the said lamp.For that purpose, the hood is connected to one of the lamps, so as tomake or break contact 26 with a contact piece, which, through thefilament of the lamp, is connected to the other terminal of the saidcircuit.

Fig. 1 of the accompanying drawing shows in vertical section a lampembodying 3c the present invention.

Fig. 2 is an elevation of the hood covering the lamp.

The lamp a is mounted in a socket Z) secured on the bottom 0 of a, metalcasing d which passes through the instrument board 6. This casing 03bears on the latter through its flange g and is secured in position bythe washer f screwing on its screw threads. Between the instrument boardand the washer f is clamped the connection 70 for the ground wire.

The reflecting surface j, which is terminated by a milled ledge 9' issecured to a cap or cover al in the bottom of which are providedopenings i permitting the passage of the direct light rays issued fromthe source a. This cap or cover al carries a sleeve part Zlongitudinally slotted for presenting a certain elasticity (Fig. 2) oneof the edges of this slot is also provided with a notch m which engageswith a finger it carried by the fixed casing (Z and its inward movementis limited by the ledge of the cap or cover (Z resting on the flange g.In these ing (Z.

PARIS, FRANCE, A FRENCH LAMP FOR INSTRUMENT BOARDS OF MOTUR VEHICLES.

40,881, and in France February 17, 1925.

conditions and as shown in Fig. 1, the lower end of the slotted sleeve Zis held at a certain distance from the bottom of the fixed cas- Betweenthe bottom '0 of the casing and the bottom of the socket b is arranged are.- silient blade at the free end of which is curved upwardly (Fig. 1).Thisblade u is in contact with the socket b but is electricallyinsulated from the bottom 0 of the casing (Z by a washer 0, the washeron which bears the upper part of the spring being made of insulatingmaterial. By angularly moving, the milled ledge y" provided on'thereflecting surface j, the cap-(Z? and sleeve Z are turned relatively tothe casing (Z, and it is therefore possible to engage or disengage thesaid sleeve Z with the resilient blade 14, the positions of contact ornoncontact being defined by the engagement of the ends of the notch mwith the fixed finger at.

In these conditions, when the sleeve Z is in contact with the resilientblade u, the electric circuit is closed through the lamp (1, socket 6,blade 14, sleeve Z, casing d and washer f on the body connection it. Itis obvious that when the contact is broken, the circuit of the lamp isalso broken.

The arrangement indicated might also be applied in'the case of alamphaving two contacts.

The arrangements described present, moreover, the advantage ofpermitting the extraction of the sleeve Z and cap d which cover the lampa, the latter as well as the socket 6 remaining however secured on theinstrument board a. It is thus possible, without other dismantling, tochange the lamp a, or if necessary, to mount in the socket Z) a plug forfeeding a hand lamp.

What I claim as my invention and desire to secure by Letters Patent is:

1. In an electric lamp for instrument board of motor vehicles, acylindrical member surrounding and supporting the bulb and havingopenings in the top thereof,a conical reflector, external to saidmember, cooperating with the said openings for receiving and reflectingthe rays emitted by the source of light-,-a metallic casing secured inthe instrument board for internally receiving the cylindrical member andthe socket supporting the bulb.

2. In an electric lamp for instrument board of motor vehicles acylindrical member surrounding and supporting the bulb and havingopenings in the top thereof,a conical reflector, external to saidmember, cooperating With the said openings for re ceiving and reflectingthe rays emitted by the source of light,a metallic casing secured in theinstrument board for internally receiving the'cylindrical member and the7 socket supporting the bulb,means for puttingthe source of light in andout of ac tion.

'3. In an electric lamp for instrument board of motor vehicles, acylindrical member surrounding and supporting the bulb and havingopenings in the top. thereof,-a conical reflector, external to saidmember, cooperating With the said openings for receiving and reflectingthe rays emitted by the source of light,a metallic casing se-' cured inthe instrument board for internally receiving the cylindrical member andthe socket supporting the bulb,-a central resilient contact passingthrough the bottom of the casing supporting the bulb,an insuj latedresilient blade, connected to the said casing,and means permittingputting the said resilient blade in and out of contact with thecylindrical member surrounding the bulb.

4. In an electric lamp for instrument board of motor vehicles acylindrical member surrounding and supporting'the I bulb and havingopenings in the top thereof,-a conical reflector, external to saidmember, cooperating With the said openings for re ceiving and reflectingthe rays emitted by the source of light,a metallic casing vSecured inthe instrument board for internally receiving the cylindrical member andthe socket supporting the bulb,-- a central resilient contact passingthrough the bottom of the casing supporting the bulb, an .insu-i latedresilient blade, connected to the said.

CHARLES HILAIRE HENRI RODANET.

